INFJ personality types are idealist personality types, and this extends to all areas of life. When an INFJ personality type focuses on what type of career they would like to pursue, one of the first things they consider is how well a potential job lines up with their idealist values.
Many INFJ personality types (and INFP personality types) have an idealized vision in their mind of what their dream job would look like. This idealized vision is strongly tied to the value system of the INFJ or the INFP, and because this is so important to INFJs and INFPs, they often overlook red flags that the job may not actually be a good fit for them.